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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<head>
    <style>
        div {
            border: 1px solid black;
            margin: 25px 50px 75px 100px;
            background-color: lightblue;
        }
    </style>
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<body>
    <h1>简写属性 margin - 4 个值</h1>

    <div>这个 div 元素的上外边距是 25 像素，右外边距是 50 像素，
        下外边距是 75 像素，左外边距是 100 像素。</div>
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